The invention discloses a parallel wave chopper used for the control of a high voltage motor speed adjusting rotor side, which is applied to the stepless speed regulation of a wound rotor type motor loaded on blowers and pumps, and the like in the industries of electric power, cement and metallurgy, and the like. The wave chopper comprises flat wave reactors L1 and L2, isolated gate bipolar transistors S1 and S2, fast recovery diodes D1 and D2, and capacitors C1 and C2; one end of the flat wave reactor L1 is connected with one end of the flat wave reactor L2 in parallel, the other end of the L1 is connected with the positive end of the isolated gate bipolar transistor S1 and the anode of the fast recovery diode D1, the other end of the L2 is connected with the positive end of the isolated gate bipolar transistor S2 and the anode of the fast recovery diode D2, the cathode of the fast recovery diode D2 is connected with the positive end of the capacitor C2, the negative end of the isolated gate bipolar transistor S1 and the negative end of the isolated gate bipolar transistor S2 are connected with the negative end of the capacitor C1 and the negative end of the capacitor C2, and the four negative ends are connected to the cathode end (E) of the output of the parallel wave chopper together. The wave chopper can guarantee that the current of the isolated gate bipolar transistors of the parallel loop of each path are basically consistent.